diff options
| author | mrb0nk500 <b0nk@b0nk.xyz> | 2019-12-11 11:28:30 -0500 |
|---|---|---|
| committer | mrb0nk500 <b0nk@b0nk.xyz> | 2019-12-11 11:28:30 -0500 |
| commit | 9526483f93b5950ecfa81a93f30b617bec22dfe1 (patch) | |
| tree | 34ee0e468f3d9ea239870967df1931cef2206dcf /test | |
| parent | 3dfde833082fc66cededd0206ae5fc76162867b6 (diff) | |
We can print to the Screen!!!!
I also added the ASR instruction, for doing arithmetic
shifts, and have added a hello world program.
Diffstat (limited to 'test')
| -rw-r--r-- | test/asr.s | 19 | ||||
| -rw-r--r-- | test/hello-world.s | 56 |
2 files changed, 75 insertions, 0 deletions
diff --git a/test/asr.s b/test/asr.s new file mode 100644 index 0000000..6377875 --- /dev/null +++ b/test/asr.s @@ -0,0 +1,19 @@ +; Testing Signed shifts. +; +; Writen by mr b0nk 500 <b0nk@b0nk.xyz> + +reset: + cps + +start: + lda.q #$-FFFF + +signshft: + asr #$1 + cmp.q #$-1 + beq start + jmp signshft + +.org $0 +done + diff --git a/test/hello-world.s b/test/hello-world.s new file mode 100644 index 0000000..fef5a46 --- /dev/null +++ b/test/hello-world.s @@ -0,0 +1,56 @@ +; Hello world. +; Writen in Sux assembly by mr b0nk 500 <b0nk@b0nk.xyz> + +; Initialize, and declare variables. +.org $8000 +string: + .byte "Hello, world!\n" + +; Get CPU into a known state. +.org $0 +reset: + cps ; Reset the processor status. + ldx.w #$FFFF ; Set up the stack pointer. + txs ; Reset the stack pointer. + +; Start of main program. +start: + ldx.w #$0 ; Reset x. + jmp print + +line_count: + iny ; Increment the line count. + cpy #$32 + beq spin ; Have we printed 50 lines? + jmp start ; Keep looping until we have printed 50 lines. + +; Printing sub routine. +print: + lda string, x ; Get character at offset x. + beq line_count ; Did we find a null terminator? + sta $C001 ; Print character. + inx ; Increment offset. + jmp print ; Keep printing more characters. + +; The other threads would clash, if we're running the same code. +; So, have them spin instead, please? +.org $1000 +spin: + nop + nop + nop + jmp spin + +.org $FFC0 +.qword reset + +.org $FF50 +.qword spin +.qword spin +.qword spin +.qword spin +.qword spin +.qword spin +.qword spin +done + |